Pattern lathe



March 11, 1952 c. L. MOORE 2,539,017

PATTERN LATHE Filed April 16. 1951 3 Sheets-Sheet l Caleb L. Moore INVENTOR.

IVBY

WW m

C. L. MOORE PATTERN LATHE March 11, 1952 3 Shee ts-Sheet 3 Filed April 16. 1951 Fig.6

Caleb L. Moore INVENTOR.

BY WW If Patented Mar. 11, 1952 PATTERN LATHE Caleb L. Moore, Roanoke Rapids, N. C., assignor of ten per cent to Fred A. Bright, ten per cent to Fannie M. Bright, five per cent to Eloise B. Tritt, and five per cent to Elvin D. Tritt, all

of Roanoke Rapids, N. 0.

Application April 16, 1951, Serial No. 221,275

\ 12 Claims, I

This invention relates to new and useful improvements in lathe machines and the primary object of the present invention is to provide a pattern lathe wherein an article of work will be shaped to the contour of a form or pattern supported on a part of the lathe.

Another important object of the present invention is to provide a pattern lathe including a movable carriage supporting a form and a work piece in parallel relation together with a bellcrank mounted for vertical swinging movement on the frame with one leg portion resting against the form and with its other leg portion supporting a sanding head that will engage the work piece as the carriage is moved laterally of the bellcrank.

Yet another object of the present invention is to provide a pattern lathe of the aforementioned character including a power drivenscrew formoving the carriage and means connecting the screw to a form holder and work piece for rotating the same as a unit.

A further object of the present invention is to provide a pattern lathe involving endless abrasive belts for engaging a work piece and means responsive to the swinging of the bellcrank and the shape of the form for tensioning the belts as they engage the work piece.

A still further aim of the present invention is to provide a lathe of the aforementioned construction that is extremely simple and practical in structure, efiicient and durable in operation, inexpensive to manufacture and service, and otherwise well adapted for the purposes for which the same is intended.

Other objects and advantages reside in details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a perspective view of the present invention in use;

Figure 2 is a transverse vertical sectional view taken substantially on the plane of section line 2-2 of Figure 1;

Figure 3 is a fragmentary front elevational view of Figure 1; I

Figure 4 is a horizontal sectional view taken substantially on the plane of section line 4-4 of Figure 2;

Figure 5 is an enlarged detail sectional view showing the manner in which the carriage moving screw is operatively connected to the carriage: and

Figure 6 is a vertical sectional view taken substantially on the plane of section line 6-6 of Figure 5.

Referring now to the drawings in detail, wherein for the purpose of illustration, there is disclosed a preferred embodiment of the present invention, the numerals l0 and I2 represent the frame and carriage respectively, a detail description of which now follows:

Frame The frame l0 comprises a pair end plates I4 and 16 that are connected by a pair of spaced parallel, horizontal bars I 8 and 20 whose ends are suitably secured to the plates 14 and I6. The plates l4 and [6 are supported by forward and rear legs 22 and 24 with the forward legs connected to the rear legs by braces 26.

An intermediate support forms part of the frame In and consists of a plate 28 having reinforced openings that accommodate the bars l8 and 20. The plate 28 is supported by forward and rear legs 30 and 32 that are connected together by a horizontal angle member 34 having a forward extension 36 for a purpose later to be described.

The legs 24 are connected to the leg 32 by longitudinal straps 38 Whose ends are fixed by welding or the like to the legs, and the legs 22 and 30 are connected by a longitudinal rod 4|) whose ends are suitably secured to the legs.

Carriage The carriage l2 comprises an open adjustable framework composed of spaced parallel transverse bars 42 and 44 that carry bearings 46. The bearings 46 are formed of two separable halves that slidably receive the bars l8 and 20.

A pair of longitudinally extending bars 48 and 50 are fixed at one of their ends to the bar 42. The bars 48 and 50 are formed with elongated slots 52 that receive bolts 54 rising from the bar 44. Nuts 56 are threaded on the bolts 54 to adjust the bars 42 and 44 relative to each other to accommodate patterns and work pieces of various lengths.

A work holder forms part of the carriage and consists of two bearing units 58 and 60 that are secured to the forwardly extending ends of the bars 42 and 44 respectively. The bearing unit 58 carries a live center 62 whereas the bearing unit 60 carries a dead center 64.

A lower bearing unit 66 is secured to the bar 42 by straps or hangers 68 and coacts with another lower bearing unit 10 secured to the bar 44 by hangers 12 to form a pattern or mandrel holder. A dead center 14 is mounted on bearing unit 70 and a live center 76 is mounted on the bearing unit 66.

Carriage moving means Means is provided for moving the carriage on the bars l8 and 26 between the end plates l4 and Hi. This means consists of a horizontal rod 18 that parallels the bars 18 and 20, and which is located between the bars l8 and 20. The rod or screw 18 is rotatably supported in bearings mounted on the plates I4, I6 and 28 and the right end portion of the rod 18 is threaded, as at 80, when viewing Figure 1.

One end of the rod 18 carries a pulley (not shown) that is connected to a pulley 82 on the drive shaft of a motor 84 by a pulley belt 86 whereby the feed screw 18 will be rotated.

As illustrated in Figures and 6, the carriage and specifically the bar 42 supports a block 88 having a smooth. surfaced concave recess 90 for receiving the upper periphery of a portion of the rod 18. A retainer arm 02 is hinged to the under-surface of the block 88 for vertical swinging movement and is formed with an internally threaded recess 94 receiving the lower periphery of the rod 18. r V The free end of the arm 82 is pivoted to a vertically slidable rod 86 carried by the bar 42. The upper end of the rod 96 is pivoted to the cam portion 98 of a lever I00 whereby the rod 96 may be raised to move the arm 92 upwardly against the block 88 so that the carriage will move as the rod 18 is rotated. The block 88 carries a depending pin I02 that will enter a recess I04 in the arm 92 to center the arm 92 relative to the block 88 when the arm is raised. A spring I06 surrounds the rod 96 and is biased between the underside of the carriage and the enlarged lower end of the rod 96 to urge the rod 86 and arm 92 downwardly.

(2 7149? Hester A stop or cam member I08 is secured to the end plate I6 and will engage and swing the lever I00 as the carriage moves to the right to force the arm 02 downwardly out of engagement with the rod 18 whereby movement of the carriage by the power means 84 is prevented.

Form holder and work holder driving means A sprocket H0 is rotatably supported on the carriage and includes an internally threaded hub that receivably engages the threaded portion 80. The sprocket II0v is connected to sprockets H2 and I I4 on the live centers 62 and 16 respectively, by a sprocket chain H6.

The sprockets H0, H2 and H4 are of such a size as to permit the live centers 62 and 16 to rotate at exactly the same speed in order to properly shape the article of work W held by the centers 62 and 64 in accordance with the contour of the form or pattern P held by the centers 14 and 16. a

Tool holder and form engager The apex of a bellcrank H8 is mounted for vertical swinging movement on a horizontal shaft I20 carried by a bearing I2 2 on the extension 36. The. lower leg portion I24 of the bellcrank II8 carries awe ght I26 that urges the'leg portion against the form P. and the other leg portion I28- of the bellcrank H8 is bifurcated to rotatably support a tool .or sanding head H that is urged against the work W.

A motor I30 is operatively connected to the sanding head H to rotate the latter against the Work as the bellcrank I I8 rocks about its pivot in response to the contour of the form P.

Sanding belts V The bifurcated end of an arch I32 is fixed to the plate 28 and supports a pair of spaced parallel rock arms I34 and I36 whose. rear ends are secured, adjustably, to the arch I32 by fasteners I38 and I40 and springs I42 and I44.

The forward ends of the arms I34 and I36 4 rotatably support an upper pair of pulleys I46 and I48 about which abrasive belts I50 and I52 are trained. The belts I50 and I52 are also trained about a lower pair of pulleys I54 and I56 supported on the furcations of a bifurcated member I58 carried by the extension 36.

Motor I30 is operatively connected to the shaft I60 supporting the pulleys I54 and I56 so that the belts I50 and I52 will be rotated by the motor I30.

Tensioning means for the abrasive belts Means is provided for tensioning the belts I50 and I52 individually so that the same may move into engagement with the work W. This means comprises a pair of bellcranks I62 and I64 whose lower leg portions extend over and across the form P and which are urged against the form P by weights or the like I66 and I68.

The upper leg portion of thebellcrank162 is pivoted to the central portion of .an elongated plate I10 whose ends rotatably support disks I12 and I14. The upper leg portion of the bellcrank I64 is pivoted to the. central portion of an elongated plate I16 whose ends rotatably support disks or rollers I18v and I80. The disks I12 and I 14 engage the inner vertical flight. of belt I52 above andbelow the work W and the disks I18 and I en age the inner vertical flight of the belt I50 above and below the. work W.

Ope t n In practical use of the present invention, the carriage, being disposedat the left end of the 1 frame, the form P is placed between the centers 14 and 16 while the work W is placed between the centers 62 and 84. The bar 44 is moved toward the bar 42 until; the work and form are held between their holding centers; and; thenthe wing nuts 56 aretightened'.

As the motors 84 and I30 are started; the carriage I2 will move to the right with the lower leg portions of the bellcranks' H8, I62 and I64 riding downwardly against the form or' mandrel The. grinding wheel H rides against the work W to shape the work and the wheel H is: moved toward and away from the workin response to swinging of the bellcrank H8 due to the shape of the form P. r r

Since the. lower leg portions of the bellcranks I62 and I64 ride against the'formP the disks I12, I14, I18. and I80 will engage the belts. andurge the. belts against the work and provide the de- I52, the lever I00 will engage the stop- I08 to urgethe lever I00 to a position whereby the arm 92 will be moved downwardly from the. feed screw 18, 80 to stop movement of the carriage.-

I-Iaving described the invention,- what is claimed as new is:

1; A pattern lathe comprising a frame includa pairof horizontal guide bars, a carriage slidably mounted on the bars, a power driven screw rotatablysupported on the. frame and paralleling the bars, a member mounted on the carriage receivably engaging the. screw to permit movement of the carriage on the bars during ro-. tation ofthe screw, a work holder includin a live center mountedonthe carriage, a form holder including a live center also mounted on the carriage, meansoperatively connecting the live centers to the SQITeW. and together. avertically swing able bellcrank mounted on the frame and including a leg portion extending across and against a form held by the form holder, and a power driven tool carried by the other leg portion of said bellcrank and engaging a work piece carried by the work holder.

2. A pattern lathe comprising a frame including a pair of horizontal guide bars, a carriage slidably mounted on the bars, a power driven screw rotatably supported on the frame and paralleling the bars, a member mounted on the carriage receivably engaging the screw to permit movement of the carriage on the bars during rotation of the screw, a work holder including a live center mounted on the carriage, a form holder including a live center also mounted on the carriage, means operatively connecting the live centers to the screw and together, a vertically swingable bellcrank mounted on the frame and including a leg portion extending across and against a form held by the form holder, a plu-, rality of, endless, rotatable belts including inner vertical flights adapted to engage a work piece mounted on the work holder, means carried by the frame rotatably supporting the belts, and tensioning means for the belts. M

3. A pattern lathe comprising a frame including a pair of horizontal guide bars, a carriage slidably mounted on the bars, a power driven screw rotatably supported on the frame and paralleling the bars, a member mounted on the carriage receivably engaging the screw to permit movement of the carriage on the bars during rotation of the screw, a work holder including a live center mounted on the carriage, a form holder including a live center also mounted on the carriage, means operatively connecting the live centers to the screw and together, a vertically swingable bellcrank mounted on the frame and including a leg portion extending across and against a form held by the form holder, a plurality of, endless, rotatable belts including inner ver tical flights adapted to engage a work piece mounted on the work holder, means carried by the frame rotatably supporting the belts, and resilient means engaging the belt supporting means and tensioning the belts.

4. A pattern lathe comprising a frame including a pair of horizontal guide bars, a carriage slid- .ably mounted on the bars, a power driven screw rotatably supported on the frame and paralleling the bars, a member mounted on the carriage receivably engaging the screw to permit movement of the carriage on the bars during rotation of the screw, a work holder including a live center mounted on the carriage, a form holder including a live center also mounted on the carriage, means operatively connecting the live centers to the screw and together a vertically swingable bellcrank mounted on the frame and including a leg portion extending across and against a form held by the form holder, a lower pair of pulleysrotatably supported on the frame in side by side relation, a supporting arm secured to the frame,'-a vertically swingable beam carried by the arm, an upper pair of side by side pulleys rotatably supported on the beam, abrasive belts trained over the upper and lower pulleys, means connected to the beam for retaining the beam in a predetermined position about its pivot, and a tool carried by the other leg portion of said bellcrank for engaging a work piece carried by the work holder.

5. A pattern lathe comprising a frame including a pair of horizontal guide bars, a carriage slidably mounted on the bars, a power driven screw rotatably supported on the frame and paralleling the bars, a member mounted on the carriage receivably engaging the screw to permit movement of the carriage on the bars during rotation of the screw, a work holder including a live center mounted on the carriage, a form holder including a live center also mounted on the carriage, means operatively connecting the live centers to the screw and together, a vertically swingable bellcrank mounted on the frame and including a leg portion extending across and against a form held by the form holder, a lower pair of pulleys rotatably supported on the frame in side by side relation, a supporting arm secured to the frame, a vertically swingable beam carried by the arm, an upper pair of side by side pulleys rotatably mounted on the beam, abrasive belts trained over the upper and lower pulleys, a spring secured to said arm and adjustably connected to the beam for resiliently adjusting the beam about its pivot, and a tool carried by the other leg portion of said bellcrank for engaging a work piece carried by the work holder.

6. The combination of claim 4, and means responsive to swinging of the bellcrank for tensioning the belts.

7. The combination of claim 6, wherein said belt tensioning means includes upper and lower disks contacting the belts, said disks being supported by the said other leg portion of said bellcrank.

8. In a wood working machine including a frame and a horizontally movable carriage slidably mounted on the frame and including means for supporting a form and a work piece in spaced parallel relation, a bellcrank mounted at its apex on the frame for vertical swinging movement, means urging one leg portion of the bellcrank against a form supported on the frame, .and a tool supported on the other leg portion of said bellcrank and engaging a work piece supported on the frame.

9. The combination of claim 8, and a motor operatively connected to the tool for rotating the latter.

10. The combination of claim 8, and an abrasive belt adapted to engage a work piece supported on the carriage, and means responsive to swinging of the bellcrank for tensioning the belt.

11. The combination of claim 10, wherein said belt includes a vertical flight, said tensioning means including upper and lower rollers mounted on the said other leg portion of said bellcrank.

12. In a wood working machine including a frame and a horizontally movable carriage slidably mounted on the frame and including means for supporting a form and a work piece in spaced parallel relation, a bellcrank mounted at its apex on the frame for vertical swinging movement, means urging one leg portion of the bellcrank against a form supported on the frame, a power driven screw threadedly connected to the carriage and rotatably supported on the frame for moving the carriage, means drivingly connecting the screw to the holding means, and a. sanding head rotatably supported on the said other leg portion of said bellcrank.

CALEB L. MOORE.

No references cited. 

